Passing closure vs function test

gistfile1.js

function wrap()
{
    var a = 5;    
    var testClosure = function testClosure()
    {
        console.log(a);
    }              
    
    func(function() { console.log(a) });
    func(testClosure);
}

function func(closure) 
{
    closure();
}             
    
wrap();